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[Qemu-devel] [Bug 1002121] Re: disk error when guest boot up via qcow2 i
[Qemu-devel] [Bug 1002121] Re: disk error when guest boot up via qcow2 image
Fri, 15 Jun 2012 01:17:15 -0000
Re-tested against latest qemu-kvm master branch with commit 0a948cbb. And
found this issue has gone.
Jan Kiszka's following patch fixed this bug.
Author: Jan Kiszka
Date: Wed Jun 6 16:28:42 2012 +0200
kvm: i8254: Fix conversion of in-kernel to userspace state
Due to a offset between the clock used to generate the in-kernel
count_load_time (CLOCK_MONOTONIC) and the clock used for processing this
in userspace (vm_clock), reading back the output of PIT channel 2 via
port 0x61 was broken. One use cases that suffered from it was the CPU
frequency calibration of SeaBIOS, which also affected IDE/AHCI timeouts.
This fixes it by calibrating the offset between both clocks on
kvm_pit_get and adjusting the kernel value before saving it in the
userspace state. As the calibration only works while the vm_clock is
running, we cache the in-kernel state across stopped phases.
Signed-off-by: Jan Kiszka
** Changed in: qemu
Status: New => Fix Released
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disk error when guest boot up via qcow2 image
Status in QEMU:
Host OS (ia32/ia32e/IA64): ia32e
Guest OS (ia32/ia32e/IA64): ia32e
Guest OS Type (Linux/Windows): Linux(rhel6u1)
kvm.git Commit: 51bfd2998113e1f8ce8dcf853407b76a04b5f2a0
qemu-kvm Commit: e54f008ef8f968cfc2f3ecab78491d180fa31efc
Host Kernel Version:3.4.0-rc7
Hardware: WSM-EP, Romley-EP
Bug detailed description:
If I boot up a guest using qcow2 image, the guest show “disk read error”. If
you press some key to continue, after being automatically repaired, the guest
can boot up.
This should be a qemu-kvm regression.
kvm + qemu-kvm = result
51bfd299 + e54f008e = bad
51bfd299 + b320b8b7 = good
1. guest rhel6u1, guest show “disk error”
guest rhel6u2, guest show black screen
this phenomenon occurs at the first time to create guest
2. create guest with raw image, this phenomenon doesn’t appear.
1.start up a host with kvm (commit: 51bfd299) and use qemu-kvm
2.qemu-img create –b /share/ia32e_rhel6u1.img –f qcow2
3.qemu-system-x86_64 -mem 1024 –hda /root/rhel6u1.qcow
Guest console shows:
error 25:Disk read error
Prss any key to continue...
Guest boot up correctly
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